My hat, large-brimmed, black and not too witty – purchased in Harrod’s especially for these occasions – was a little tight. ‘Darling, your head has swelled from all the praise,’ said Will, as I struggled to put it on. The comment was not quite as light-hearted as it sounded. Even now, having been the sitting MP for almost two decades, Will could be jealous of his constituency. There was a silence as I struggled to smooth over a ruffled surface as I would have done in the past. But lately I had felt less flexible, less accommodating, sadder. ‘I’ve earned it, Will,’ I snapped.

Will was taken aback. ‘Yes, of course you have.’

Aware that I was being scrutinized, I adjusted the brim, which brought my view of the opposite pew into better focus. It was part of my function to be scrutinized and I had chosen my outfit with care. A slim-fitting black suit that did not shriek ‘Extravagance!’, modestly heeled shoes, and a warm, friendly lipstick. The effect was smart, clever (but not too clever), worn by a woman of confidence and conviction who had been broken in to the job. A Good Wife. I knew this because it had taken several attempts, and not a few discarded outfits, to get it right.

Will nudged me to attention. It was kindly and affectionately, rather than imperiously, meant. We functioned on nudges, my husband and I, little jabbing reminders of our duty, our tasks, our partnership. In the early days, I gave the nudges too. Now, for various reasons, I was more of a nudgee – but I reckoned that, in time, that would change too.

I let my hand rest briefly against his thigh, knowing that with this subversive, suggestive touch I would unsettle him.

On the other side of Will sat Matt Smith, the new chairman of the association, who sported degrees from Warwick and Harvard and had a lot of experience in think tanks. He dressed in linen suits, collarless shirts and lace-up boots, and talked about shifting voting patterns and focus groups. He was, he maintained, a professional.

On the other side of me Chloë picked at the cuticles of her left hand, which, at the last count, sported five silver rings, including a thumb ring that Sacha, her cousin, had brought back from his last gig up north. ‘It’s your job to attend funerals for old bats, not mine,’ she had stormed at Will. ‘Besides, I don’t believe in God.’

‘That puts you in the majority,’ Will pointed out, not unreasonably, then cracked the three-line whip.

I suppose every shared life, every separate life, has bloodstained patches and tattered remnants of compromise. Sometimes, too, the dull ache of small martyrdom.

Chloë now fixed her gaze dreamily on the pilgrims. She was a smaller, infinitely more delicate version of her father with fair hair and dark eyes. One day, she would be beautiful, and that promise gave me deep, unqualified pleasure.

The congregation sang, ‘I Vow To Thee My Country’, and Will delivered the address with good grace. I listened with only half an ear – his private secretary had already rung and asked me for any contributions. ‘She had a great heart,’ I said for I had grown fond of her.

‘Darling,’ Will commented later, ‘Not quite the right term.’

Again, I had turned on him without warning: ‘Shut up, Will. Just shut up. Please. ’

‘What is the matter with you, Fanny?’ he asked, a little bewildered, a little rattled.

After the service Chloë vanished. At the reception, Will and I consoled a shell-shocked Paul Veriker then went home, and Mannochie came too. This was normal. Along with everyone else, Will’s agent had been absorbed somehow into the running of our household. ‘He’s your real wife,’ I had told Will, more than once.

On the way upstairs, I paused on the landing. It was growing dark, the lovely mysterious moment of the day when I played the game of not-turning-on-the-light-until-the-very-last-minute. In that transition between light and dark, an observer becomes extra-sensitive to objects and to the textures of light and shade, of peace, happiness, disappointment, resdessness…

Like many things, the view out of the (faux) Gothic window had changed. One of the two fields we overlooked had been sold for development and was now home to twenty four-bedroomed houses. The second field had survived and the rooks still cawed and swirled above the beeches.

I leant on the sill. I knew myself better now and I had learnt that if I was quite still something surprising might swim up out of the spaces in my head. Sometimes a fleeting thought. Sometimes a revelation or a conclusion. Its chief element was always of surprise and I found myself craving the delight of discovery. One of the saints, I think it was Teresa, wrote that the soul has many rooms. So does a life, and a marriage. Motherhood too. I was increasingly curious to shine a light into each one.

But there was nothing tonight, except a faint sensation of despair, which made my eyes fill with tears. Why, I did not know.

I wiped them away and continued upstairs to our bedroom where I stepped out of the suit, brushed it, hung it up and put on some jeans.

Our bedroom was a depository. It was the sort of room that invited dumping and the dumped included a stool with a tapestry seat featuring two kittens that Will had felt obliged to buy at a jumble sale in aid of a cancer charity. Whenever I looked at it, it looked back reproachfully: first, because I hated it, second, because I had not done anything with it.

In other worlds, into which I occasionally peered, mainly in Chelsea and the Shires, interior decoration was taken more seriously. There, the houses were the frames for rich, rare materials that breathed expense. The walls gleamed with the sludge of authentic paints and no one would dare to dump into those rooms a stool with tapestry kittens. Our house was plain, straightforward fare. (Economical, argued Will, with the grin that, when I first married him, made my heart soar.) A last-minute stab at Victorian Gothic, ugly in places, painted in colours from the local DIY store, it was utilitarian and solid. I had never loved it, never sought to pretty it up or make it smart. We jogged along, the house and I.

A departing backbencher’s wife, Amy Greene, had once lectured me on economy. In order to survive (the words had dropped from her defeated-looking mouth), it is necessary to be economical with expectation. I had not discussed with her – or, for that matter, with Will – the little economies of spirit that creep into the everyday. They were whisked out of sight and never mentioned.

I pulled the bedspread straight. That, at least, was lovely. A traditional American quilt, sent by my mother, Sally, it was aged and faded, sewn with exquisite stitches and care. That never failed to delight.

Down in the kitchen Mannochie was making a late tea and Will was talking on the phone. On Sunday mornings, Mannochie often joined us for breakfast, tiptoeing into the house, and when I came down, still sleep-mussed, to the kitchen, it was to the inviting smell of frying bacon. It was no surprise, then, when he offered me cake from my own tin. ‘Brigitte made it specially for you two,’ I said. Brigitte was our au-pair-cum-housekeeper for the summer. I cut two slices and dropped the knife into the sink, well out of reach. I watched Mannochie eat, and imagined how the sugary crumbs would dissolve on his tongue.

‘How’s your son?’ I asked.

Mannochie failed to repress his smile. ‘Turning out to be a gymnast. And the fastest runner in the school.’

Information on the Mannochie home-life was not often released, even after the unexpected late marriage, which had produced a pallid, thoughtful child who fetched up, occasionally, at our house to be fed fish fingers at the kitchen table.

Will put down the phone. ‘Do you think Matt Smith will do a good job? Pearl Veriker’s a hard act to follow.’

A suggestion of humour softened Mannochie’s features. ‘He’s keen on putting forward women and minorities.’

I looked at Will. ‘You’d better watch it.’

Will sent me his private signal-a tiny lift of the eyebrows – which meant: ‘Share the joke.’ Or ‘You’re right.’ Or ‘Thank you.’ Or sometimes all three.

After Mannochie had driven off to scoop up Mrs Mannochie from the swimming-baths, Will retired to his study to work on the red boxes. I moved around the kitchen, checking, making lists, when the sound of raised voices issued from Meg’s side of the house.

Will’s sister had lived with us in the Stanwinton house for a long time now and there had been plenty of opportunity to argue about most things, including what we meant by being good. Meg was as fair and delicate as I was dark and tall, and looked like an angel. ‘I’m a hopeless case,’ she once said, ‘bad all the way through.’ She sighed and shot me a look. ‘Poor me. But you’re good, Fanny’ She was at her most sarcastic. ‘The bit I lack.’

I screwed the top on to a bottle of olive oil with fingers that, suddenly, felt all thumbs. That sort of commotion usually meant one thing – and the house had been free of it for some time. Meg had been drinking. Not now, I thought. And then, why now, Meg? You’ve been doing so well.

Will would have heard – and his lips would have gone white. It had taken me several years to work out that this meant fear, loathing and love in equal measure, and that it was my job to protect him. ‘I’ll go,’ I called.

I went down the passage that ran the width of the house and let myself into Meg’s part of the house. ‘Sacha?’

‘Upstairs, Fanny.’

I found him in Meg’s bedroom, manhandling his mother’s inert body on to the bed, and hastened to help. Meg was hunched on her side, and her breath soughed audibly in and out. I smoothed her hair back from her forehead. ‘I should have checked on her.’